Oxford, UK – 23 May 2011: Oxford BioMedica plc (“Oxford BioMedica” or “the Company”) (LSE: OXB), a leading gene therapy company, announces that new data from the on-going Phase I/II trial of ProSavin® for the treatment of Parkinson’s disease (PD) were presented at the American Society of Gene & Cell Therapy (ASGCT) 14th Annual Meeting held in Seattle, USA by Professor Stéphane Palfi, Principal Investigator at the Henri Mondor Hospital in Paris, on Saturday 21 May 2011.

Highlights of third cohort at six months (2x dose, enhanced administration)

Average motor function1 improvement of 43%, with a maximum of 61% in one patient;

Patient diary data2 show an increase in functional “ON” time (when PD symptoms are not present) of approximately 3 hours;

Patient diary data2 show a decrease in “OFF” time (after withdrawal of PD medication) of approximately 4 hours;

Daily dose of L-DOPA “equivalent” therapy has either reduced or remained stable;

Quality of life has either improved or remained stable on the PDQ-39 questionnaire3 and these findings are consistent with the UPDRS activities of daily living (ADL) subscore4; and

Continued favourable safety profile with no serious adverse events related to ProSavin® or the enhanced administration procedure developed by the Company.

1. Motor function is assessed according to the Unified Parkinson’s Disease Rating Scale (UPDRS) in patients’ “OFF” state (i.e. after withdrawal of PD medication).2. Patient diary data only available for n=2 patients at six months.3. Quality of life is assessed based on a standard measure of clinical benefit using a patient questionnaire known as PDQ-39.4. The activities of daily living (ADL) subscore of the UPDRS captures the impact of PD on daily function.

Commenting on the six-month third cohort results, Professor Stéphane Palfi, Principal Investigator at the Henri Mondor Hospital in Paris, said: “Cohort 3 results at six months confirmed the safety profile of ProSavin® and the enhanced delivery method which permits a significant reduction of the surgical time. The encouraging efficacy data on Parkinsonian motor symptoms obtained in cohort 3 patients show that we are definitely approaching the right dose for the randomised Phase II study.”

Stuart Naylor, Chief Scientific Officer of Oxford BioMedica, said: “The ProSavin®data set is extremely promising in terms of the improvements we are seeing across multiple endpoints. With patient diary measures further supporting the positive impact on patients’ lives, these data underline the potential for this novel approach to address the motor symptoms of Parkinson’s disease. Our LentiVector® platform technology is designed to treat chronic, degenerative diseases and the ProSavin® results to date demonstrate the long-term benefits associated with a single administration.”

Tom Isaacs, President and Co-Founder of The Cure Parkinson’s Trust and person with Parkinson’s disease, said: “ProSavin® is one of the more advanced of the prospective gene therapy products in development for Parkinson’s and is unique in its aim to achieve dopamine replacement. These results demonstrate it also has the potential to make a huge difference to those of us living with this terrible condition. For 40 years, people with Parkinson’s have struggled with the complexities and side-effects of oral L-DOPA. These statistics indicate that, at last, there might be an effective and enduring alternative means of re-asserting control over the movement of your own body. People with Parkinson’s everywhere should take heart.”

The on-going Phase I/II study is designed to assess the safety, efficacy and dose evaluation of ProSavin® in patients with mid-stage PD who are experiencing reduced benefit on L-DOPA “equivalent” therapy. The trial is being conducted at two centres of excellence for neurosurgery; the Henri Mondor Hospital in Paris with Professor Stéphane Palfi as Principal and Coordinating Investigator, and at Addenbrookes Hospital in Cambridge, UK, with Dr Roger Barker as Principal Investigator.

Two dose levels (1x and 2x) have been evaluated in nine patients to date. Six patients received the 2x dose, the latter three of which were treated using an enhanced administration procedure that has been shown to reduce the surgical delivery time by 50%; facilitates higher dosing; and has the potential to provide better reproducibility of administration as study centres expand. Pre-clinical evidence suggests that the enhanced procedure may also improve the distribution and, consequently, may improve efficacy of ProSavin®, which is further supported by the new data reported today.

Summary of independently verified improvements in motor function to date:

Cohort

Dose

Administrationmethod

3 months(UPDRS)

6 months(UPDRS)

1 year(UPDRS)

2 years(UPDRS)

1, n=3

1x

Original

Mean 27%Max, up to 30%

Mean 30%Max, up to 48%

Mean 29%Max, up to 44%

Mean 20%Max, up to 30%

2, n=3

2x

Original

Mean 28%Max, up to 53%

Mean 34%Max, up to 53%

Mean 29%Max, up to 56%

-

3, n=3

3x

Enhanced

Mean 26%Max, up to 52%

Mean 43%Max, up to 61%

-

-

A further higher (5x) dose of ProSavin® is being assessed in the current six-patient cohort; the scaled equivalent to the optimal dose in pre-clinical studies. Three-month results from the first three patients in the 5x dose cohort are expected mid-2011 and will be announced in H2 2011 following a review by the study’s independent Data Monitoring Committee (DMC). Planning is on-going for a sham-controlled Phase II study that will recruit up to 50 patients. Depending on the results from the 5x dose cohort and the independent opinion from the study’s DMC, a randomised Phase II trial of ProSavin®could be initiated in the EU/US in 2012.

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Notes to editors

About Oxford BioMedica®

Oxford BioMedica (LSE:OXB) is a leading gene and cell therapy company focused on developing life changing treatments for serious diseases. Oxford BioMedica and its subsidiaries (the “Group”) have built a sector leading lentiviral vector delivery platform (LentiVector®) through which the Group develops in vivo and ex-vivo products both in-house and with partners. The Group has created a valuable proprietary portfolio of gene and cell therapy product candidates in the areas of oncology, ophthalmology and CNS disorders. The Group has also entered into a number of partnerships, including with Novartis, Sanofi, GSK, and Immune Design, through which it has long-term economic interests in other potential gene and cell therapy products. Oxford BioMedica is based across several locations in Oxfordshire, UK and employs more than 250 people. Further information is available at www.oxfordbiomedica.co.uk.